The high was 89 degrees on Oct. 7, 2007. For the first time in Chicago Marathon history, officials cut the race short as hundreds of runners laboring across oven-like streets were treated for heat-related illnesses. The stoppage happened about 3 1/2 hours after the start amid complaints of insufficient water for the nearly 36,000 runners. Of the 35,867 who started, 24,933 finished. More than 300 runners were taken from the course in ambulances. One runner, a Michigan police officer with a heart condition, died, although the Cook County medical examiner’s office determined his death was not heat-related.
Chicago Marathon 2021: Route map and road closures
